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  Projection Matrix Resize LWJGL3  (Read 2979 times)
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Offline Oxen

Junior Devvie


Medals: 5
Exp: 6 years



« Posted 2016-05-10 16:25:31 »

I'm running a check every loop to see if the screen has been resized and if so, update the projection matrix but when I resize my screen It dose not respond correctly





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    public void checkScreen(long window){
      IntBuffer w = BufferUtils.createIntBuffer(1);
      IntBuffer h = BufferUtils.createIntBuffer(1);
      org.lwjgl.glfw.GLFW.glfwGetWindowSize(window, w, h);
      int width = w.get(0);
      int height = h.get(0);
      if(window_width!=width||window_height!=height){
         createProjectionMatrix(window);
         renderer.updateProjectionMatrix(projectionMatrix);
         terrainRenderer.updateProjectionMatrix(projectionMatrix);
         
         
      }
   }
   
   private void createProjectionMatrix(long window){
      System.out.println("Updating Screen Size");
      IntBuffer w = BufferUtils.createIntBuffer(1);
      IntBuffer h = BufferUtils.createIntBuffer(1);
      org.lwjgl.glfw.GLFW.glfwGetWindowSize(window, w, h);
      int width = w.get(0);
      int height = h.get(0);
      window_width = width;
      window_height = height;
      float aspectRatio = (float) width / (float) height;
      float y_scale = (float) ((1f / Math.tan(Math.toRadians(FOV/2f))) * aspectRatio);
      float x_scale = y_scale / aspectRatio;
      float frustum_length = FAR_PLANE - NEAR_PLANE;
             
      projectionMatrix = new Matrix4f();
      projectionMatrix.m00 = x_scale;
      projectionMatrix.m11 = y_scale;
      projectionMatrix.m22 = -((FAR_PLANE + NEAR_PLANE) / frustum_length);
      projectionMatrix.m23 = -1;
      projectionMatrix.m32 = -((2 * NEAR_PLANE * FAR_PLANE) / frustum_length);
      projectionMatrix.m33 = 0;
   }
Offline ziozio
« Reply #1 - Posted 2016-05-10 17:44:04 »

Have you reset GL11.glViewport?
Offline Oxen

Junior Devvie


Medals: 5
Exp: 6 years



« Reply #2 - Posted 2016-05-11 13:15:37 »

Have you reset GL11.glViewport?

I completely forgot, thank you
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